material costs money to put it in LEO. |4] And finally, SPORE is a space-structure which is designed to withstand the forces of space, not the forces on Earth or of getting it into space. Acknowledgements — The author is indebted to Michael Concannon, Dr. Peter Glaser, and Jesco von Puttkamer for their helpful and encouraging discussions concerning this work. REFERENCES 1. National Aeronautics and Space Administration, Space Settlements — A Design Study, NASA SP-413, 1977. 2. M.A. Paluszek, Design of a Small Manned Space Station for Long Duration Orbital Missions, Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, MA, 1978. 3. M.R. Sharpe, Living in Space: The Astronaut and His Environment, Doubleday, Garden City, NY, 1969. 4. H.S.F. Cooper, Jr., A House in Space, Bantam, NY, 1978.
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